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If that is not enough to fix the problem, then the best thing to do is resetting the PDA to factory settings after backing up all your personal data.After backing up your data with HotSync, perform a hard
reset, this will erase all applications and returns your device to its
factory default settings.

To perform a hard reset:
1. Hold down the power button on the front panel of the PDA.
2.
While holding down the power button, use a paper clip to press the reset button.
3. Release the power button.
4. You will get a message warning that you are
about to erase all the data stored on the PDA, do the
following:
Press the top scroll button on the front panel
to complete the hard reset and display the startup screen.If you press any other button you will do a soft reset, that will not fix the problem. In that case restart the procedure.5. After doing hard reset the unit will return to the initial factory state. All third party installed applications will be deleted, and setting will be reported to factor default.

Performing a ResetSoft ResetWhen you perform a soft reset, the device deletes any data that has not been saved but saves any data that has been stored in memory. Try performing a soft reset if the device does not respond when you tap the display or press a button.

To perform a soft reset, use the stylus to press the reset button.Hard Reset NOTICE: When you perform a hard reset, you lose all the data stored and any programs you installed on your device.Perform a hard reset if:•You want to delete all the data stored on your device.•You forget your password and need to clear it.•Your device is experiencing severe operational problems and you have already attempted a soft reset. NOTICE: It is strongly recommended that you back up your data before you perform a hard reset. See ActiveSync Help on your computer for more information.To perform a hard reset:1 Press and hold the power button.2 With the stylus, hold the reset button for about 2 seconds.3 Follow the instructions on the screen.

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You may want to delete the following items regularly to avoid memory gettinglow:• Messages from the Inbox, Drafts, and Sent folders in Messaging.• Retrieved e-mail messages from the phone memory.• Saved browser pages.• images and photos in images.To delete contact information, calendar notes, call timers, call cost timers, gamescores, or any other data, go to the respective application to remove the data.If you are deleting multiple items and another of the following notes are shown:Not enough memory to perform operation. Delete some data first. or Memory low.Delete some data. try deleting items one by one (starting from the smallest item).Clearing the calendar memory - To remove more than one event at a time, go tothe Month view and select Options→Delete entry→

The 3230 isn't able to show you what memory is actually being used, so it isn't giving you an accurate reading.Do you have a memory card installed? Copy some files over to your memory card and try it that way. Hope you solve your problem.

It also happened to me and my friend's cellphone. I suspected a virus from a text message we received. You have to reformat your phone as suggested by iroarload:
1. switch phone off, probably take out the battery if the power button doesn't work.
2. hold down call (green), 3 and * all at the same time. best with right hand.
3. turn phone on. with left hand.
4. wait a bit and phone will come up with formatting. does take a bit, so be patient.